When you're planning on any type of construction project, even if this means a very involved remodel or renovation of your home, you'll need to have a number of certifiers or surveyors involved in the process. Some inspections are required by law, in order for you to get your building and occupancy permits, and some surveyors might offer optional services that you should strongly consider. Note what a construction certifier does, why this matters to your project, and what types of certifiers you might hire, even if their services are not legally required for your construction plans.
A site certifier might be needed for a new construction project, to ensure the site is ready for a foundation to be poured, and to ensure that your new construction won't interfere with underground sewer lines or cables, or with overhead wires. Even if their services are not legally required, you might have a site certifier survey your property before any home renovation work, to note if the soil may need grading so that water doesn't collect around the building's foundation. A surveyor can also inspect for buried asbestos and other contaminants that would become airborne due to your construction.
Swimming pools and spas
Installing a swimming pool or spa will typically require the services of a certifier, so they can ensure your plans for the pool don't interfere with underground pipes or cables. After the pool is installed, a surveyor may also need to inspect the surrounding fence to ensure it's compliant with local building codes and provides adequate safety. Even if you're only planning the installation of a lap pool or wading pool, or any small above-ground pool, be sure you know the requirements for getting your site and the pool itself certified, before and after construction.
Private road certifiers
If you have a very large plot of land, don't assume you can simply pour concrete or crush some gravel over an area of that land in order to create your own road. Private roads can easily interfere with buried pipes and cables, and you also need to ensure you won't cause drainage issues for nearby properties by compacting your property's soil, or by adding gravel to the soil to create that road. Have an inspector check your plans and your site beforehand, even if your road will be very small and used for lightweight vehicles, to avoid any risk to your property and to any neighbouring properties as well.